Surgical stapler having temperature-based motor control
First Claim
1. A surgical stapler, comprising:
- a drive system;
an electric motor mechanically coupled to the drive system;
a battery electrically couplable to the electric motor; and
a control system electrically connected to the electric motor, wherein the control system comprises;
an H-bridge circuit comprising a high side and a low side, wherein the low side of the H-bridge circuit comprises;
first and second switching devices; and
a resistive heating element electrically connected in series with the first switching device; and
a temperature sensing device positioned proximate the resistive heating element, wherein the control system is configured to control a force applied to the drive system based on a temperature associated with the resistive heating element and sensed by the temperature sensing device.
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Accused Products
Abstract
A surgical stapler. The surgical stapler includes a drive system, an electric motor, a battery and a control system. The electric motor is mechanically coupled to the drive system. The battery is electrically couplable to the electric motor. The control system is electrically connected to the electric motor and includes an H-bridge circuit and a temperature sensing device. The H-bridge circuit includes a high side and a low side. The low side of the H-bridge circuit includes first and second switching devices, and a resistive heating element electrically connected in series with the first switching device. The temperature sensing device is positioned proximate the resistive heating element. The control system is configured to control a force applied to the drive system based on a temperature associated with the resistive heating element and sensed by the temperature sensing device.
4578 Citations
21 Claims
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1. A surgical stapler, comprising:
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a drive system; an electric motor mechanically coupled to the drive system; a battery electrically couplable to the electric motor; and a control system electrically connected to the electric motor, wherein the control system comprises; an H-bridge circuit comprising a high side and a low side, wherein the low side of the H-bridge circuit comprises; first and second switching devices; and a resistive heating element electrically connected in series with the first switching device; and a temperature sensing device positioned proximate the resistive heating element, wherein the control system is configured to control a force applied to the drive system based on a temperature associated with the resistive heating element and sensed by the temperature sensing device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A surgical stapler, comprising:
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a drive system; an electric motor mechanically coupled to the drive system; a battery electrically couplable to the electric motor; and a control system electrically connected to the electric motor, wherein the control system comprises; an H-bridge circuit comprising a high side and a low side, wherein the low side of the H-bridge circuit comprises; first and second switching devices; and a resistive heating element electrically connected in series with the first switching device; a temperature sensing device thermally coupled to the resistive heating element; and a temperature correlation system electrically coupled to the temperature sensing device, wherein the control system is configured to control a force applied to the drive system based on a current measured in the temperature correlation system. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A surgical stapler, comprising:
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a drive system; an electric motor mechanically coupled to the drive system; a battery electrically couplable to the electric motor; and a control system electrically connected to the electric motor, wherein the control system comprises; an H-bridge circuit comprising a high side and a low side, wherein the low side of the H-bridge circuit comprises; first and second switching devices; and a light emitting diode electrically connected in series with the first switching device; and a light intensity sensing device optically coupled to the light emitting diode, wherein the control system is configured to control a force applied to the drive system based on an intensity of light emitted by the light emitting diode and sensed by the light intensity sensing device. - View Dependent Claims (17, 18, 19, 20)
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21. A surgical stapler, comprising:
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a drive system; an electric motor mechanically coupled to the drive system; a battery electrically couplable to the electric motor; and a control system electrically connected to the electric motor, wherein the control system comprises; an H-bridge circuit comprising a high side and a low side, wherein the low side of the H-bridge circuit comprises a first leg comprising a first switching device and a second leg comprising a second switching device; and a light-emitting device electrically connected to the H-bridge circuit, wherein a parameter associated with the light-emitting device varies in relation to a current passing through the first leg of the H-bridge circuit, and wherein the control system is configured to control a force applied to the drive system based on a measurement of the parameter.
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Specification